PI. I. 



Fig. 1. Cednis (dlantica, section through j)art of an acetolyzed pollen ^vall. 



The nexine has been splil olT from the sexine at the ])oint indicated by tlie 



arrow. The endonexine is laminated. < 18,000. The black horizontal line 



indicates 1 ^i. (EMG; from Afzelins, in (irana palynologica, 1: 2, 1956.) 



i 



•% 



Fig. 2. Cephalot(t.viis luiiui, exine stratification, x 42,000. The black hori- 

 zontal line indicates 1 u- (FMG; from Afzelins, in (irana palvnologica, 1: 2, 

 1956.) 



